Abstract
By using a new imaging technique for pairs of electrons emitted in coincidence from a surface, we investigated the two-electron photoemission from a Cu111 surface in the energy range from = 40 to 60 eV. The full solid angle coverage provides a comprehensive view into the details of the emission process and allows for a quantitative study of the exchange-correlation XC hole in the two-electron momentum final state. Evaluating the data in a center-of-mass frame the XC hole yields a value of 0.76 a.u. as smallest distance in momentum space. Additionally, we can demonstrate a significant dependency of the emission dynamics on the light polarization.
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